157581944091919 has 16 divisors (see below), whose sum is σ = 159768095068960. Its totient is φ = 155411346729600.

The previous prime is 157581944091839. The next prime is 157581944091941. The reversal of 157581944091919 is 919190449185751.

It is a cyclic number.

It is not a de Polignac number, because 157581944091919 - 2²¹ = 157581941994767 is a prime.

It is a super-2 number, since 2×157581944091919² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157581944092919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83146969 + ... + 85021069.

It is an arithmetic number, because the mean of its divisors is an integer number (9985505941810).

Almost surely, 2^{157581944091919} is an apocalyptic number.

157581944091919 is a deficient number, since it is larger than the sum of its proper divisors (2186150977041).

157581944091919 is a wasteful number, since it uses less digits than its factorization.

157581944091919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1878250.

The product of its (nonzero) digits is 146966400, while the sum is 73.

The spelling of 157581944091919 in words is "one hundred fifty-seven trillion, five hundred eighty-one billion, nine hundred forty-four million, ninety-one thousand, nine hundred nineteen".